The Arbor Day Founation is the world's oldest and largest tree-planting organization. Its million members plant millions of trees every year. New members receive 10 free trees. The foundation began September 3, 1971 with a mission "to inspire people to plant, nurture, and celebrate trees". The Arbor Day Holiday began more than 120 years ago in Nebraska City, Nebraska, it was founded by J. Sterling Morton. The Foundation is supported by donations, selling trees and merchandise, and by corporate sponsors, such as Home Depot, Citigroup, Frito Lay, and Enterprise Rent-A-Car.